Bug 841363. Ensure padding-rect edges are included in scrollable area used to compute scrollWidth/scrollHeight for overflow:visible elements. r=matspal

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extra : rebase_source : 067c9577f797350274783d3c7cc682b5f74b998a
Bug 860253. Clear clip state on children of an nsDisplayTransform because they're in a different coordinate system, and we'll clip the nsDisplayTransform itself. r=mattwoodrow

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extra : rebase_source : 731dfa20fa0fda1feb7ab582deced011ff9c25fc
Bug 860579. Make FindContentInDocument use the frame tree as much as possible. r=mattwoodrow

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extra : rebase_source : c4d05d33fdc6b2bcc99437808f78ada8770f9263